Restricted maximum likelihood analysis of the contribution of seawater pH(T) and chlorophyll concentration to variance among out-plant experiments in total larval length (4A) and postoral arm asymmetry (4B) of 48-h old Echinometra spp. A. Analysis of Variance (type III) was made using a Satterthwaite approximation for degrees of freedom. The proportion of variance explained by each fixed effect in the model is based on marginal R2 calculations.